ITAGAKI Takahiro wrote:
The feature could be achieved by an extension module using new executor
hooks in 8.4. It is just like contrib/pg_stat_statements;
Well, it is a good idea.

Displaying last-query-string may be useful, but it is not a feature for
general purpose. So, it may be an external module.

Now, I have two choice.

1. Displaying last-query-string by pg_stat_activity (suggested by Gurjeet):
   Extends the pg_stat_activity to display "previous_query".
   We can check only a previous query.

2. Displaying query-string-history by external module (suggested by Itagaki):
   Using executor hook to get a query string and stores it in
   shared memory.
   We can check specified number of query string history.

I think I will try mainly 2.
# Or this feature may merge to pg_stat_statements.
Any comments welcome.

Best regards,
--
Tatsuhito Kasahara
kasahara.tatsuh...@oss.ntt.co.jp

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